Here's my take on Intel side, keep in mind that I worked with the totality of the 1400$ budget here. It's actually pretty close to a PC I built last week. I'll post up the specs and explain after.
Case: CoolerMaster Elite RC-330 39.99$
PSU: Seasonic M12II 620 620W 89.99$
Motherboard: Gigabyte GA-X58A-UD3R 209.99$
CPU: Intel Core i7-930 2.8GHz Quad 289.99$
RAM: Patriot Extreme Viper 6GB DDR3 1600MHz 174.99$
Video: ASUS ENGTX470 GTX 470 1280MB GDDR5 314.99$
HDD: Seagate Barracuda 1.5TB 32MB 89.99$
DVD: Samsung SH-S243N/BEBE 24.99$
OS: Microsoft Windows 7 Home Premium X64 99.99$
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Total: 1334.91 $
Case: Basic but very functional, it got a good airflow through all the case. One of the best advantage I find in that budget case are the snaps for the 3.5" / 5.25" cages. But really you could go with any casing in that range and it would do the work. Personally, I built around at least 30-40 pcs since last summer with that particular case and got no complaints from anyone yet lol.
PSU: If there's a part in a computer that I like to invest more just to have my mind free of trouble, it's the PSU. Strid hit the spot right on when he says 600W is good enough for that kind of system unless, like he says, you want to go the SLI/Crossfire way. As for my choice, I always had good experience with Seasonic in the past and it's a good brand. Granted you'll pay 90$ for a PSU but you'll have something sturdy on your hand for years to come. Additionally, the PSU above is modular so you can fit just the cables you need and leave the rest in the box and add them when you need it

. It's also backed up by Seasonic 3 years warranty.
Motherboard: Yeah, well, I'm a Gigabyte fan as much as an ASUS fan. In this case, I decided to go with, to my taste, the best X58 board for the cost on the market at the moment. Core i7 boards are not very cheap to get in the first place. It's a low-end mainstream board but does the job perfectly well. For the cost, you won't get anything similar from ASUS unfortunately. An another interesting feature for future expansion: 2 USB 3.0 ports in the back and a SATA3 controller too inside.
CPU: Intel Core i7-930, do I need to say more lol? That quad core is a beast even stock. Granted you'd have more fun OCing with AMD and stuff but, if you were planning buying from Dell, in the first place, I doubt overclocking was something you were looking into in the first place. So I went with best Intel cpu on the market for the price. You don't have a lot of choice in the first place unless you want to pay above 500$ for a couple of MHz in extra. In any case, you can't go wrong with it. You won't have any issues playing, working, editing, compiling or anything.
RAM: Again it's a personal choice as a builder. Never had big issues with Patriot in the past couple of years. Yeah I got a couple of DOA and RMA to do but nothing out of control compared to OCZ for example. The motherboard supports DDR3 and triple channel. The logic would dictate to go with a kit of 3X2GB giving you a total of 6GB, which, is not bad at all considering today's standard. You also have the possibility to expend later on. The only advantage I find in Patriot beside the obvious quality, is the latency on their low latency kits. But honestly you could go with any brand. Patriot, Kingston and Corsair are pretty much the brands I trust when it comes to RAM.
Video: I'm always at a crossroad there and I always have difficulties to find reasons justifying going past the 300~$ price tag on a video card. Usually it goes from 300$ to 500$ for the next step. I'm not a big fan of the "old" ATI, never tried any card since AMD bought them though, I actually didn't have any opportunity since people who order me computers prefers nVidia or don't need any card since they use onboard video. It's also the last thing I check in a quote too the budget I have for a video card in general. In this case we happened to have the 300$ available so I went for the best card we could get for the money. I can't say exactly what a GTX 470 can compare on ATI's side but I'm sure as hell you won't have any trouble playing XIV or any video game that will come out for a while. It's also their brand new series of cards that got out in the last couple of months. Hell I can't even find my GTX 275 anywhere anymore lol.
@Strid: That would be GT -> GTS - > GTX to differentiate low/mid/high
HDD: 1 500GB is big enough to stash your documents, music, photos, porn, video games. As for the brand, I prefer seagate. They are usually more silent than Western Digital and you also got 5 years warranty on their hard drive. I'd suggest investing in an external hard drive if you need to backup important files too in the near future.
DVD: I went for the most basic DVD burner on the market but you could go for LG or Pionner if you wanted too. The price is relatively the same for every company. Just pick one in the bunch. I would not recommend Sony or Lite-On but it's due to past bad experiences with both companies.
OS: You don't want the 32 bits version since you'll be over 3gb of rams. Unless you need the features in the Pro edition, I'd recommend sticking with Home Premium since it would be money wasted.
I think I covered pretty much all the bases. Again I worked with the full extent of the 1400$ budget in the OP to make this quote. It's a high-end system and it's far from a budget build. I took into consideration that you wouldn't make any OC hence why there is no extra cooler. It should last you at least 4-5 years. I change my computers every 2 years or so due to work but for someone that goes on the internet, play some games, do homework/work, I really doubt you'll have to change it soon. For the price listing, I went also on newegg to keep everything in perspective.
Just one thing though, do you need a monitor?
I'll add some extra later on because I'm sure I forgot stuff.